Potassium Carbonate → 3-(4-Bromothiophenoxy)propionic acid

To a solution of 1.44 g (35.7 mmol) of NaOH in 20.0 ml degassed H2O (sparged with argon) was added 6.79 g (35.7 mmol) of 4-bromothiophenol. The resulting mixture was stirred at room temperature for 30 minutes. A second flask was charged with 2.26 g (16.3 mmol) of K2CO3 and 15 ml of degassed H2O. To this solution was added (in portions) 5.00 g (32.7 mmol) of 3-bromopropionic acid. The resulting potassium carboxylate solution was added to the sodium thiolate solution, and the resulting mixture stirred at room temperature for 48 hours. The mixture was filtered and the filtrate extracted with benzene, and the combined organic layers were discarded. The aqueous layer was acidified with 10% HCl and extracted with EtOAc. The combined organic layers were washed with saturated aqueous NaCl, dried over MgSO4 and concentrated under reduced pressure. The resulting solid was recrystallized from Et2O-hexanes to give the title compound as off-white crystals. 1H NMR (CDCl3): δ 7.43 (2H, d, J=8.4 Hz), 7.25 (2H, d, J=8.4 Hz), 3.15 (2H, t, J=7.3 Hz), 2.68 (2H, t, J=7.3 Hz).

1. stirringthe resulting mixture stirred at room temperature for 48 hours
2. filtrationThe mixture was filtered
3. extractionthe filtrate extracted with benzene
4. extractionextracted with EtOAc
5. washThe combined organic layers were washed with saturated aqueous NaCl
6. dry with materialdried over MgSO4
7. concentrationconcentrated under reduced pressure
8. customThe resulting solid was recrystallized from Et2O-hexanes

ORD-Eintrag

ord-36c4a87265064cc08b62c96d46b23826

Quelldatensatz

uspto-grants-2005_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06942980B1